Commutator for dynamo-electric machines



(NOM0de1.)'

P. M. BROWN 85 G. B. BOSWORTH.

GOMMUTATOR FOR DYNAMO E LEGTRIG MACHINES, N0. 280,288. Patented June 26, 1888.

a Q I Z Fig.2

WITNEEEEE J 1NVENTURE N. PETERS. Phawuliwgnpber. Wash? C UNITED STATES PATENT OFFICE.

FRANK M. BROWN, OF BOSTON, AND CHARLES B. BOSWORTH, OF EVERETT, MASSACHUSETTS, ASSIGNORS TO THE HELIOS ELECTRIC LIGHT COMPANY OF MAINE.

COMMUTATOR FOR DYNAMO-ELECTRlC MACHINES.

SPECIFICATION forming part of Letters Patent No. 280,288, datedJune 26, 1883.

Application fi ed February 1:2, 1883. (No model.)

To all whom it may concern:

Be it known that we, FRANK MORTIMER BROWN and CHARLES B.BoswoRTH, residing, respectively, at Boston, in the county of Suffolk and State of Massachusetts, and at Everett, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Commutators, of which the following is a specification.

Our invention relates to an appliance to be used in connection with dynamo electric machines for adjusting the commutator, the object being to make an automatically-adjusted commutator which, when the dynamo is work- I 5 ing, will promptly regulate the electric current to the work required. WVe attain this object by the mechanism' illustrated in the accon1pa nying drawings, in which- Figure 1 is a longitudinal section, showing the commutator and the shaft of the dynamomachine. Fig. 2 is a cross-section of the same, and Fig. 3 is an elevation of a part.

In the drawings, A represents the shaft up on which the armature-bobbins are mounted.

The commutator-bars H H H &c., are attached to an insulating-cylinder, D, said cylinder being held longitudinally in place by the collar D, Fig. 1. which is rigidly attached to the shaft A by the set-screw d.

D is an annular screw,which,being screwed into the part. D, effectually holds the entire commutator longitudinally in place.

C is a metallic bushing, which is solidly affiXed to the interior of the insulating-cylin 5 der D.

On the interior of the bushing C two spiral grooves are out, into which corresponding spiral splines, b, I), and I)", made on the sleeve B, fit. (See Figs. 2 and 3.) The sleeve B can 'slide freely longitudinally on the shaft A,

but cannot turn on it, as that motion is controlled by a straight spline, a, on the shaft A.

. (See Figs. 1 and 2.)

The annular grooved piece B is attached to the sleeve B, as shown in Figs. 1 and 3, and is in working connection 5 with a forked lever, M N. This forked lever M N is pivoted at M, and has attached to its outer end, by a pin at M a rod-armature, 1?, which is actuated by a coil, P.

K K, Fig. 2, are the brushes, which maybe made in any of the desirable methods.

The operation of our invention is as follows: The several armature-bobbins are connected to their respective commutator-bars H H H 860., in the usual manner, and the brushes K 5 5 adjusted in relation to the commutator-bars, armatures, and field-magnets so as to give off the greatest amount of electricity that the machine is rated for. Then the sleeve B is adjusted by movement of the lever M N, Fig. 1, until a medium current will be sent out bythe machine. In this condition the machinery is ready to be balanced by resistance-coils, &c., to the work expected of it.

It must be understood that the moving of the sleeve B longitudinally by the lever M N will cause a partial revolution of the commutator in relation to the shaft A and the armature-bobbins, so that any movement of the le ver M N will cause the ends of the brushes K K to occupy different positions in the commu tater-blocks H H, and thus change the amount of current in the field-magnets.

We claim In a regulator for a dynamo-electric machine, the combination of the shaft A, sleeve B, lever M N, armature 1?, and coil P with the commutator D H H H 850., all adapted to operate substantially as described, and for the purpose set forth.

FRANK M. BROWN. CHARLES B. BOSVVORTH.

Vituesses:

HELEN M. FEEGAN, FRANK G. PARKER. 

